Synthesis and characterization of PANI/MnO2 bi-layered electrode and its electrochemical supercapacitor properties

• Characterization of MnO2, PANI and PANI/MnO2 reported.
• CV, galvanostatic charging discharging and EIS reported.
• The observations have shown substantial increase in voltage window of MnO2.
• Paper reports improvement in specific energy and power of the ES.
• Simulation studies are carried out on observed EIS.

The present paper discusses synthesis and characterization of MnO2, poly-aniline (PANI) and PANI/MnO2 thin films on stainless steel substrates (SS) for electrochemical supercapacitor applications. The MnO2 thin films are formed using galvano-static electrodeposition of Mn, following electrochemical oxidation in a KOH bath. PANI and PANI/MnO2 layered thin films are also prepared via electrochemical polymerization and electrodeposition techniques. The thin films are investigated for their structural and morphological studies. Further, the electrochemical super-capacitive properties are probed using cyclic voltametry (CV), galvano-static charging–discharging and electrochemical impedance spectroscopy (EIS) techniques. The layered PANI/MnO2 has shown a significant increase in voltage window and consequently the specific energy and power over parent MnO2 electrode.

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